Patents by Inventor Charles W. Mayfield

Charles W. Mayfield has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4377304
    Abstract: A door lock includes a cooperating bracket and hasp having aligned openings for receiving a pin. In the locking position of the pin, in which the pin is received through the aligned openings, a transverse hole in the lower end portion of the pin is aligned with a vertically elongated slot in a wall of the bracket for receiving a security member to prevent upward movement of the pin out of the openings. The openings are shaped to have aligned outwardly extending longitudinal grooves which receive a longitudinal flange on the pin. A cam member pivots between pin blocking and pin releasing positions and has a flat lower flange with a vertical hole therethrough. The hasp has a flat upper wall with a hole therethrough aligned with the hole in the cam member lower flange for receiving a security member to prevent movement of the cam member from its pin blocking position to its pin releasing position.
    Type: Grant
    Filed: October 6, 1980
    Date of Patent: March 22, 1983
    Assignee: Youngstown Steel Door Company
    Inventors: Charles W. Mayfield, Oliver J. Jenkins
  • Patent number: 4353187
    Abstract: A corrugated metal door having a damaged lower section is repaired by removing the entire lower damaged section, including the door bottom frame member and portions of the door side frame members, and replacing same with prefabricated door repair section.
    Type: Grant
    Filed: November 12, 1980
    Date of Patent: October 12, 1982
    Assignee: The Youngstown Steel Door Company
    Inventors: Oliver J. Jenkins, Jr., Charles W. Mayfield